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https://issues.apache.org/jira/browse/HIVE-11304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14694329#comment-14694329
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Prasanth Jayachandran commented on HIVE-11304:
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properties file is not supported anymore. Log4j2 initialization will ignore
properties file specified through system property log4j.configuration or the
presence of log4j.properties in the classpath (autoloading). There is new
system property for log4j2 for specifying the path to configuration file
"log4j.configurationFile". If the log file is not set through this system
property, hive's log4j configurator (LogUtils.java) will default to
hive-log4j2.xml in classpath. If user wants to load their own configuration
file, they should put it classpath (probably via HIVE_CONF_DIR) or use
HIVE_OPTS to explicitly set -Dlog4j.configurationFile=<path-to-file>. The
fallback is to use the default *log4j2.xml that is part of hive-common.jar. I
haven't fully looked into the implication of HADOOP_USER_CLASSPATH_FIRST env
yet (which will put the log4j2 bridge api jars first). I will confirm if that
will have any impact on hadoop logging. [~gopalv] do you have any thoughts on
this?
> Migrate to Log4j2 from Log4j 1.x
> --------------------------------
>
> Key: HIVE-11304
> URL: https://issues.apache.org/jira/browse/HIVE-11304
> Project: Hive
> Issue Type: Improvement
> Affects Versions: 2.0.0
> Reporter: Prasanth Jayachandran
> Assignee: Prasanth Jayachandran
> Attachments: HIVE-11304.2.patch, HIVE-11304.3.patch,
> HIVE-11304.4.patch, HIVE-11304.5.patch, HIVE-11304.6.patch,
> HIVE-11304.7.patch, HIVE-11304.patch
>
>
> Log4J2 has some great benefits and can benefit hive significantly. Some
> notable features include
> 1) Performance (parametrized logging, performance when logging is disabled
> etc.) More details can be found here
> https://logging.apache.org/log4j/2.x/performance.html
> 2) RoutingAppender - Route logs to different log files based on MDC context
> (useful for HS2, LLAP etc.)
> 3) Asynchronous logging
> This is an umbrella jira to track changes related to Log4j2 migration.
> Log4J1 EOL -
> https://blogs.apache.org/foundation/entry/apache_logging_services_project_announces
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